- Racing Car Supplies, Welland
- Radio & Television Repair Shops , Welland - TV Repair
- Radio Communications Equipment & Systems , Welland
- Radio Stations & Broadcasting Companies, Welland
- Railroad Companies, Welland
- Ready Mix Concrete, Welland - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Welland
- Real Estate, Welland - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Welland
- Real Estate Agent - Property Lessors, Welland
- Real Estate Appraiser, Welland - Appraisal Services
- Real Estate Appraisers & Consulting Services, Welland
- Real Estate Broker, Welland
- Real Estate Developers, Welland
- Real Estate Management, Welland
- Real Estate Services, Welland
- Record Storage, Destruction & Management, Welland
- Recreational Equipment & Supplies Companies, Welland
- Recycling Drop-Off Centers, Welland
- Recycling Scrap & Waste Materials, Welland - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Welland
- Reflexologists, Welland
- Rehabilitational Job Training Services, Welland
- Religious Goods & Church Supplies Stores, Welland
- Religious Organizations, Welland
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- Religious Practitioners, Welland
- Rental & Leasing Business Equipment, Welland
- Repair Services, Welland
- Research Services, Welland
- Residential, Welland
- Residential Apartments, Welland
- Residential Architect, Welland
- Residential Care Facilities, Welland
- Residential Construction Contractors, Welland - General Contractors
- Restaurant Equipment, Welland
- Restaurant Equipment & Supplies, Welland
- Restaurant Equipment Repair & Service, Welland - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Welland
- Restaurants - Breakfast Brunch Lunch, Welland
- Restaurants/Food & Dining, Welland
- Resume Service, Welland
- Retail Book Stores, Welland
- Retirement & Estate Planning, Welland
- Retirement Communities & Home, Assisted Living & Apartments, Welland
- Retirement Homes, Welland
- Retirement Planning Consultants & Services, Welland
- Roadside Assistance, Road Service & Towing Service, Welland
- Roofing Consultants, Welland - Roofing Companies
- Roofing Contractors, Welland - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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